The Nature of Turbulent Flame Propagation in a Homogeneous Spark-Ignited Engine

Groff, Edward G.; Matekunas, Frederic A.

doi:10.4271/800133

Cited by 59 publications

(17 citation statements)

References 23 publications

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“…Similar results were reported by Liou et al [89] and Groff et al [85]. Another important finding from these studies was that the turbulence intensity in an engine was seen to be proportional to mean piston speed, [85,89,87], with a maximum turbulence intensity equal to approximately ½ [2,89,87].…”

Section: Effect Of Structured Flowssupporting

confidence: 76%

“…Boggs and Borman [90] demonstrated that increasing in-cylinder turbulence by introducing tumble or swirl resulted in increases in peak heat flux in a motoring engine by 70%, with Overbye et al [11] showing a similar relationship between turbulence and heat transfer in a motored CFR engine. Mean gas velocities within the cylinder have also been seen to double as a result of using a shrouded intake valve versus an unshrouded valve [85]. This can be seen clearly in Figure 2.3 and Figure 2.4 above which show the effects increasing swirl in a CFR engine has on in-cylinder velocity, as well as the correlation between piston speed and flow velocity.…”

Section: Effect Of Structured Flowsmentioning

confidence: 55%

“…Piston speed has been shown to be the variable which has the greatest effect on in-cylinder velocity. The magnitude of the in-cylinder velocities and the resulting turbulence has been shown to be proportional to the mean piston speed [2,85,86,87,88,89]. This is seen in Figure 2.1 taken from Heywood [2] which shows the ensemble-averaged mean velocity profile within a motored engine normalized by mean piston speed.…”

Section: Motored Enginementioning

confidence: 95%

“…This can be seen clearly in Figure 2.3 and Figure 2.4 above which show the effects increasing swirl in a CFR engine has on in-cylinder velocity, as well as the correlation between piston speed and flow velocity. The introduction of swirl as a result of using a shrouded intake valve has also been seen to produce near solid-body rotation [2,85]. In addition, both Liou et al [89] and Lancaster et al [88] demonstrated that imposing swirl reduced the rate of velocity dissipation in their disk shaped cylinders with flat topped pistons.…”

Section: Effect Of Structured Flowsmentioning

confidence: 99%

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The Influence of Thermal Barrier Coating Surface Roughness on Spark-Ignition Engine Performance and Emissions

Memme

Wallace

2012

ASME 2012 Internal Combustion Engine Division Fall Technical Conference

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The effects on heat transfer of piston crown surface finish and use of a metal based thermal barrier coating (TBC) on the piston crown were studied in an SI engine. Measured engine parameters such as power, fuel consumption, emissions and cylinder pressure were used to identify the effects of the coating and its surface finish. Two piston coatings were tested: a baseline copper coating and a metal TBC. Reducing surface roughness of both coatings increased in-cylinder temperature and pressure as a result of reduced heat transfer through the piston crown. These increases resulted in small improvements in both power and fuel consumption, while also having measurable effect on emissions. Oxides of nitrogen emissions were increased while total hydrocarbon emissions were decreased. Improvements attributed to the TBC were found to be small, but statistically significant. At an equivalent surface finish, the TBC performed better than the baseline copper finish.iii

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Section: Effect Of Structured Flowssupporting

confidence: 76%

Section: Effect Of Structured Flowsmentioning

confidence: 55%

Section: Motored Enginementioning

confidence: 95%

Section: Effect Of Structured Flowsmentioning

confidence: 99%

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The Influence of Thermal Barrier Coating Surface Roughness on Spark-Ignition Engine Performance and Emissions

Memme

Wallace

2012

ASME 2012 Internal Combustion Engine Division Fall Technical Conference

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“…This speed is called the turbulent flame speed. Groff and Matekunas (1980) indicates that the turbulent flame speed is proportional to the laminar flame speed, and a factor which increases monotonically with the turbulence intensity.…”

Section: Laminar and Turbulent Flame Speedmentioning

confidence: 99%

Cylinder Air/Fuel Ratio Estimation Using Net Heat Release Data

Tunestål¹,

Hedrick²

2001

IFAC Proceedings Volumes

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An estimation model which uses the net heat release profile for estimating the cylinder air/fuel ratio of a spark ignition engine is developed. The net heat release profile is computed from the cylinder pressure trace and quantifies the conversion of chemical energy of the reactants in the charge into thermal energy. The net heat release profile does not take heat-or mass transfer into account. Cycle-averaged air/fuel ratio estimates over a range of engine speeds and loads show an RMS error of 4.1% compared to measurements in the exhaust. r

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Flame Propagation and Heat-Transfer Effects in Spark Ignition Engines

Borgnakke

1984

Fuel Economy

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The Nature of Turbulent Flame Propagation in a Homogeneous Spark-Ignited Engine

Cited by 59 publications

References 23 publications

The Influence of Thermal Barrier Coating Surface Roughness on Spark-Ignition Engine Performance and Emissions

The Influence of Thermal Barrier Coating Surface Roughness on Spark-Ignition Engine Performance and Emissions

Cylinder Air/Fuel Ratio Estimation Using Net Heat Release Data

Flame Propagation and Heat-Transfer Effects in Spark Ignition Engines

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